<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-bind指令</title>
    <style>
        .classA{color: red;}
    </style>
</head>
<body>
    <script src="/js/vue.js"></script>
    <div id ="app">
       <div v-bind:class="{classA:isRed}">我是v-bind指令，绑定class属性</div>
       <div v-bind:style="{fontSize:size +'px'}">我是v-bind指令，绑定style属性</div>
    </div>
    
    <script>
       var vm =new Vue({
         el:"#app",
         data:{
           isRed:true,
           size:20
         }
       })
    </script> 
    
</body>
</html>